It is really annoying that drugs proponents ignore the obvious negative effects of drugs. Pretending that LSD is harmless is utter utter bulshit. There are so many cases of serious mental problems including permanent insanity caused by psychadelics. And of course there are also the thousands of people that are not exactly insane but have their brains pretty much fried and are just not very good for anything useful an…
LSD does not cause people to be schizophrenic; schizophrenia shows itself during the most likely years for people to be experimenting with drugs.
edit: and to add to what kinghajj mentioned about Philip K. Dick; Dick was on amphetamines, and amphetamines have a very established history of actually making you long-term crazy.